linux-kernel - Re: ICH8 CF timeout (regression)...

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Date:	Fri, 3 Aug 2007 11:22:44 +0100
From:	"Daniel J Blueman" <daniel.blueman@...il.com>
To:	"Mark Lord" <lkml@....ca>
Cc:	"Tejun Heo" <htejun@...il.com>, jgarzik@...ox.com,
	linux-ide@...r.kernel.org,
	"Linux Kernel" <linux-kernel@...r.kernel.org>
Subject: Re: ICH8 CF timeout (regression)...

On 02/08/07, Mark Lord <lkml@....ca> wrote:
> Daniel J Blueman wrote:
> > On 02/08/07, Tejun Heo <htejun@...il.com> wrote:
> >> Daniel J Blueman wrote:
> >>> I'll grab kernel logs from the legacy ATA boot; what else can help
> >>> debug this issue? No problem testing patches too.
> >> Yeap, please post the old log.
> >
> > Not much actually - perhaps I need to enable some debugging:
> >
> > Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
> > ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
> > hdc: SanDisk SDCFX-4096, CFA DISK drive
> > ide1 at 0x170-0x177,0x376 on irq 15
> > hdc: max request size: 128KiB
> > hdc: 8027712 sectors (4110 MB) w/1KiB Cache, CHS=7964/16/63
> >  hdc: hdc1 hdc2 hdc3
> >
> >>> --- [2]
> >>> ata2.00: limiting speed to UDMA/33:PIO4
> >>> ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
> >>> ata2.00: cmd c8/00:08:00:00:00/00:00:00:00:00/e0 tag 0 cdb 0x0 data 4096 in
> >>>          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
> >>> ata2: soft resetting port
> >>> ata2.00: configured for UDMA/33
> >>> ata2: EH complete
> >> What happens after this?
> >
> > More EH occurs - I've left it for ~5 mins, but let me know if longer
> > would give more information, eg if it converges on a lower speed.
> >
> > Would it be useful to compare some of the port setup registers in the
> > working and non-working cases? Or any other debug I can grab?
>
> I'm betting that this is the exact same problem we recently debugged
> for someone else here:  there's a Marvell PATA->SATA bridge chip between
> that CF card and the SATA controller, and it only works with PIO modes.
>
> Tejun.. perhaps (for debugging) a simple patch to disallow DMA completely,
> just to see if PIO works?

The ICH8 south-bridge I have is the mobile variant and does come
equipped with native parallel IDE - see page 447:
http://download.intel.com/design/chipsets/datashts/31305603.pdf . I do
see 35MB/s with DMA enabled from my CF on the 1 in 15 times the
libata-kernel does work.

I can dump off and decode the configuration registers for the timing
and bus master registers in the working and non-working libata cases,
and the legacy ATA working case and see what's different.

Dan
-- 
Daniel J Blueman
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